package com.cuijq.eduservice.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.cuijq.eduschool.exceptionhandler.EduException;
import com.cuijq.eduservice.entity.EduCourse;
import com.cuijq.eduservice.entity.EduCourseDescription;
import com.cuijq.eduservice.entity.frontvo.CourseFrontVo;
import com.cuijq.eduservice.entity.frontvo.CourseWebVo;
import com.cuijq.eduservice.entity.vo.CourseInfoVo;
import com.cuijq.eduservice.entity.vo.CoursePublishVo;
import com.cuijq.eduservice.mapper.EduCourseMapper;
import com.cuijq.eduservice.service.EduChapterService;
import com.cuijq.eduservice.service.EduCourseDescriptionService;
import com.cuijq.eduservice.service.EduCourseService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.cuijq.eduservice.service.EduVideoService;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * <p>
 * 课程 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2021-05-09
 */
@Service
public class EduCourseServiceImpl extends ServiceImpl<EduCourseMapper, EduCourse> implements EduCourseService {


  //注入小节和章节service
  @Autowired
  private EduVideoService eduVideoService;

  @Autowired
  private EduChapterService chapterService;
  //课程描述注入
  @Autowired
  private EduCourseDescriptionService courseDescriptionService;

  //添加课程基本信息的方法
  @Override
  public String saveCourseInfo(CourseInfoVo courseInfoVo) {
    //1 向课程表添加课程基本信息
    //CourseInfoVo对象转换eduCourse对象
    EduCourse eduCourse = new EduCourse();
    BeanUtils.copyProperties(courseInfoVo,eduCourse);
    int insert = baseMapper.insert(eduCourse);
    if(insert == 0) {
      //添加失败
      throw new EduException(20001,"添加课程信息失败");
    }

    //获取添加之后课程id
    String cid = eduCourse.getId();

    //2 向课程简介表添加课程简介
    //edu_course_description
    EduCourseDescription courseDescription = new EduCourseDescription();
    courseDescription.setDescription(courseInfoVo.getDescription());
    //设置描述id就是课程id
    courseDescription.setId(cid);
    courseDescriptionService.save(courseDescription);

    return cid;
  }

  //根据课程id查询课程基本信息
  @Override
  public CourseInfoVo getCourseInfo(String courseId) {
    //1 查询课程表
    EduCourse eduCourse = baseMapper.selectById(courseId);
    CourseInfoVo courseInfoVo = new CourseInfoVo();
    BeanUtils.copyProperties(eduCourse,courseInfoVo);

    //2 查询描述表
    EduCourseDescription courseDescription = courseDescriptionService.getById(courseId);
    courseInfoVo.setDescription(courseDescription.getDescription());

    return courseInfoVo;
  }

  //修改课程信息
  @Override
  public void updateCourseInfo(CourseInfoVo courseInfoVo) {
    //1 修改课程表
    EduCourse eduCourse = new EduCourse();
    BeanUtils.copyProperties(courseInfoVo,eduCourse);
    int update = baseMapper.updateById(eduCourse);
    if(update == 0) {
      throw new EduException(20001,"修改课程信息失败");
    }

    //2 修改描述表
    EduCourseDescription description = new EduCourseDescription();
    description.setId(courseInfoVo.getId());
    description.setDescription(courseInfoVo.getDescription());
    courseDescriptionService.updateById(description);
  }

  //根据课程id查询课程确认信息
  @Override
  public CoursePublishVo publishCourseInfo(String id) {
    //调用mapper
    CoursePublishVo publishCourseInfo = baseMapper.getPublishCourseInfo(id);
    return publishCourseInfo;
  }

  @Override
  public void removeCourse(String courseId) {
    //1 根据课程id删除小节
    eduVideoService.removeVideoByCourseId(courseId);

    //2 根据课程id删除章节
    chapterService.removeChapterByCourseId(courseId);

    //3 根据课程id删除描述
    courseDescriptionService.removeById(courseId);

    //4 根据课程id删除课程本身
    int result = baseMapper.deleteById(courseId);
    if(result == 0) { //失败返回
      throw new EduException(20001,"删除失败");
    }
  }

  @Override
  public Map<String, Object> getCourseFrontList(Page<EduCourse> pageParam, CourseFrontVo courseFrontVo) {
    //2 根据讲师id查询所讲课程
    QueryWrapper<EduCourse> wrapper = new QueryWrapper<>();
    //判断条件值是否为空，不为空拼接
    if(!StringUtils.isEmpty(courseFrontVo.getSubjectParentId())) { //一级分类
      wrapper.eq("subject_parent_id",courseFrontVo.getSubjectParentId());
    }
    if(!StringUtils.isEmpty(courseFrontVo.getSubjectId())) { //二级分类
      wrapper.eq("subject_id",courseFrontVo.getSubjectId());
    }
    if(!StringUtils.isEmpty(courseFrontVo.getBuyCountSort())) { //关注度
      wrapper.orderByDesc("buy_count");
    }
    if (!StringUtils.isEmpty(courseFrontVo.getGmtCreateSort())) { //最新
      wrapper.orderByDesc("gmt_create");
    }

    if (!StringUtils.isEmpty(courseFrontVo.getPriceSort())) {//价格
      wrapper.orderByDesc("price");
    }

    baseMapper.selectPage(pageParam,wrapper);

    List<EduCourse> records = pageParam.getRecords();
    long current = pageParam.getCurrent();
    long pages = pageParam.getPages();
    long size = pageParam.getSize();
    long total = pageParam.getTotal();
    boolean hasNext = pageParam.hasNext();//下一页
    boolean hasPrevious = pageParam.hasPrevious();//上一页

    //把分页数据获取出来，放到map集合
    Map<String, Object> map = new HashMap<>();
    map.put("items", records);
    map.put("current", current);
    map.put("pages", pages);
    map.put("size", size);
    map.put("total", total);
    map.put("hasNext", hasNext);
    map.put("hasPrevious", hasPrevious);

    //map返回
    return map;
  }
  //根据课程id，编写sql语句查询课程信息
  @Override
  public CourseWebVo getBaseCourseInfo(String courseId) {
      return baseMapper.getBaseCourseInfo(courseId);
  }

}
